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Seviper gets Virulent as a secondary ability.
Virulent: The effect of poison is amplified.(Poison will cause the Pokemon to lose twice the regular amount of HP)
Zangoose gets Astra as a secondary ability.
Astra: Slash moves hit two to five times in a row.(The moves Slash, Cross Poison, Night Slash, Psycho Cut, and Shadow Claw now hit the target 2-5 times at half the regular damage. There is a 37.5% chance that it will hit 2 times, a 37.5% chance that it will hit 3 times, a 12.5% chance that it will hit 4 times, and a 12.5% chance that it will hit 5 times.)